Drill jar and the method of making same



June 16, 1925. 1,541,911

' R. ARMOUR DRILL JAR AND THE METHOD OF MAKING SAME Filed Oct. 4, 1925 Patented June 16, 1925.

RICHARD ARMoUR, or LOS. AN E ES, cemroRnra- YnRILL A AND THE amnesty MAKINGSAME,

1 Application filed October 4, 192a Serial no. eee,4e4l' To; all whomit may concern:

Be itlrnown. that I, RICHARD ARMOUR, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of Californimhave invented new and useful Improvements in Drill Jars and the Methods of Making Same, of which the following is a'specification.

This invention relates to an instrument knownasa drill j'arused as a member in a string of drilling or fishing tools in the cable system employed in drilling wells, and particularly pertains to the method of-making the jar.

"It is well known that drill jars consist of two reins, anupper and a lower, disposed parallel to each other in right angle planes andhinterconnected. The upper rein comprises essentially three sections, namely, a head or cap constituting an end portion of the rein, a middle section having side members a-nd a' slot therebetweem'and' a bottom section which fimpactsagainst a seat in the lower rein momentarily after the drilling tool strikesthebottom of the wellin drilling action.

of the same The lower or bottom rein is substantially. structure as the upper rein, except that the lower end of the lower rein is adapted to be secured tothe drilling tool,

whereas the head of'theupper rein is somewhat difierently adapted to connected toithe cable. 1 p ,v

1 In making a drill jar according to previous practicethe head portion and the slotbe. indirectly ted portion of a rein have been manufac tured separately in finished form in order to permit interconnection of-one rein with the other. The slotted portion of the rein then forms a fork having the side members of the slot as prongs, and the head portion being formed at one end on a line to abut against and joined to the ends of the prongs and extending across the end of the slot, after the fork of the lower rein has been inserted in the fork of the upper rein, and properly ad justed in a plane at right angles to the plane of the upper rein. The heads of the reins are then welded to the forks. The weld joint thus formed extends at right angles to the stress thereon occurring when the cable system is suddenly raised causing the top of the slot of the lower rein to impact against the lower end of the slot of the upper rein. This sudden stress or live load is necessitated by the fact that the drilling tool is usually partlyembedded in the'rock when striking the same in downward motion, therefore a sudden jerk'of the cablesystem to loosen it from the rock, thisjerk placing the reins ofthejar in tension and placing a strain on the one-plane weld at right angles to it. The result of making such a weld has frequently resulted during drilling in knocking the head oil of the upper rein, by which action the drilling tool is lost and has to be fishedput, which is an expensive, tedious, difficultand sometimes impossible operation, and in the latter instance the well must sometimes be abandoned;

It is therefore an object of this invention to provide an improved drill jar by making the reins in such mariner that they cannot be broken so readily. i

Another object of this invention is to'provide a method for connecting the two reins of] my improved drill jar.

' Other objectsmay be inferred from reading the following specification. I 1 r i My invention will be more readily under stood by reference to the drawings, in whichi Figure 1 isa side elevation of an upper I'GIIL,

Figure 2 is a sideelevation'of a partially finished lower rein. r a 1 Figure 3 is a perspective viewqshowing a step in the process of interconnecting the upper, and lower reins Figure 4 is a perspective view showing the reins in normal adjustment. but with the lowerrein unfinished. 1

Figure 5 is a perspective view ofthe fin;

jar. j .i 1.

More particularly, Figure 1 shows an upper rein 8 consisting of ahead portion 9, a bottom portion 10, and a middle portion 11 having side members 13 and 14: as sides of a slot 15. The sides 13 and 14 are temporarily spread apart, which may be done by bowing outwardly opposing sections of the sides 11 and 1 1, as shown, respectively, at 17 and 18; this operation being effected for the purpose of providing space for the proper adjustment of the lower rein, as will appear more clearly hereinafter.

Figure 2 shows the lower rein 19 as consisting of an unfinished bottom end portion 20, an upper end portion 21, a middle portion 22 having side members 23 and 24, enclosing a.slot 25, the end portion 21 and the middle portion 22 being in finished form.

requiring The re iri theh Grit in a line eiitenf dingi from a point 29 near the bottom of the" slot to a point on the outer serrate" of the lower end portion 20, the line 27 be ing directed at first in adirection long i tudinally of the rein; and then curi' ed to form scarfed interlocking members82 and 33. By this severance the side member 23 r re immthe. owe 6 2d .99? the r anew hen. ie-spell d emw di y, p e afblm hi htemre re ie e orm 3. ar ma. do ted i leav g an O e 36 etween' it and, the scarred portion 33. I .1 member. e f t e n Bm y h tbe P s ed t eugh t e ope in 3611b its bowed portion 18 and passed under the itwardlypulled severed member 351 of, rein 19, the outwardly b'owed section 17 of the side inemberllof rein 8 being passed over the outwardly .p'ulled side severedmember 35, therein 8 being held in a position substantially transverse to the rein 19, as shown Six in Figure 3. h 5 After the reins are properly positioned with respect to each other,- t-he head end of the rein 8 may be turned in a clockwise direction until the v,rein 8 is nearly parallel to the rein 9.. The rein 8 may then be turned over through substantially ninety degreegnwhen the end section 21 of the rein 19 will fit into the upper end of the slot, 15,

' and the lower end 10. of the rein 8 will fit into thevlowe r end of the slot .25; the reins then being parallel to each other in right angle planes, as shown in Figure 4.

After properly adjusting the reins 8 and 19 with respect to eacliother, the outwardly extendin arm 35 may be placed back in its n'ormalfiosition so that the scarfs' 27 and 32 interlock. g

The rein 19 may then be welded alongth'e line f severance 27, after or befbre which process the bbwed eiit slide ection 17 and 18 of therein 8 may be straightened to normal positron.

It will be perceived that by employing my' drill jar stress is 7 when the reins are in tension but is on integral parts of the reins. The lower end pereien of the rein 19 may then be finished according to the usual methods to tire form shown in Figure 5.

By thus "forming the reins, only one of the reins is welder, arid the welded rein is formed of one piece of metal ofthe same eharacter throughout which 'faeilitates the formation of a proper weld at the joint, a a more perfect fusion may be effected than when; we separate ieces of metal having different carbon elements are joined, as is now the common practice. This, with the marketing formation or the pans r the joint and the general extension of the joint in the direction or pulling or pushing strains, insure against separation of the joint due to working strains on the jars.

I 'claimk I 1. In a drill jar, a rein having a pair of side members and joined together at one end. thereoi and adapted to b e separated at their other ends, the separable end portions of the side members being scarred to provide an interlocking joint, and saidscarred end portions being welded together along the interlocking joint. V 2. Themethodof making a pair of jar links which consists: in initially forming a pair bf separate links with the side members ofeacli link connected together at their ends, then severing the stock at the endsof the side members of one of the linkswi th the severance extending diagrammatically into the side of the stock and then returning at an angle and leading to the space between the sides of the link rneinbe'rs, thu's freeing one of the side meinbers of a link, which is then bent outwardly and passed through the otliersliiikand thereafter straightened and joiiied at the line of severance by weldmg.

oh the weld placed meme-b renew. 

